Incommensurate-commensurate magnetic phase transition in SmRu2Al10
PhysRevB_92-17_174427.pdf 951 KB
Magnetic properties of single crystalline SmRu2Al10 have been investigated by electrical resistivity, magnetic susceptibility, and specific heat.We have confirmed the successive magnetic phase transitions at TN = 12.3 K and TM = 5.6 K. Resonant x-ray diffraction has also been performed to study the magnetic structures. Below TN, the Sm3+ moments order in an incommensurate structure with q1 = (0,0.759,0). The magnetic moments are oriented along the orthorhombic b axis, which coincides with the magnetization easy axis in the paramagnetic phase. A very weak third harmonic peak is also observed at q3 = (0,0.278,0). The transition at TM is a lock-in transition to the commensurate structure described by q1 = (0,0.75,0). A well-developed third harmonic peak is observed at q3 = (0,0.25,0). From the discussion of themagnetic structure,we propose that the long-range RKKY interaction plays an important role, in addition to the strong nearest-neighbor antiferromagnetic interaction.
This work was supported by Grants-in-Aid for Scientific Research (Grants No. 24540376, No. 24340087, No. 15K05173, and No. 15K05175) from the Japan Society for the Promotion of Science (JSPS).
Physical Review B
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American Physical Society
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Graduate School of Advanced Sciences of Matter